Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of determining an uplink power control mode in a broadband wireless communication system supporting an open loop power control and a closed loop power control, the method comprising: transmitting a power control change request message from a subscriber station (SS) to base station (BS) to change a power control mode; deciding, by the BS, to change the power control mode between the open loop power control and the closed loop power control; and transmitting a power control change response message from the BS to the SS including the decided power control mode, wherein the power control change response message includes a power control mode change field indicating the decided power control mode, a start frame field indicating a frame number as to when the indicated power control mode is activated, a power adjust field indicating a change in power level that the SS should apply to its current transmission power, if the indicated power control mode is the closed-loop power control, and an Offset perSS field indicating a change in power level that the SS should apply to an open loop power control formula, if the indicated power control mode is the open-loop power control.
2. A method of determining an uplink power control scheme in a Base Station (BS) of a wireless communication system supporting at least two uplink power control schemes, the method comprising: receiving from a Subscriber Station (SS), a power control change request message including information about a requested power control scheme; and transmitting a power control change command message to the SS, wherein the power control change request message includes a power control mode change field indicating a power control scheme requested by the SS, and an UpLink (UL) Transmission (Tx) power field indicating a transmit power of an uplink burst that carries the power control change request message, and wherein the power control change command message includes a power control mode change field indicating a power control scheme, a start frame field indicating a frame number at which the indicated power control scheme is activated, a power adjust field indicating a change in power level that the stations should apply to its current transmission power, if the indicated power control scheme is a closed-loop power control scheme, and an Offset perSS field indicating a change in power level that the SS should apply to an open loop power control formula, if the indicated power control scheme is an open-loop power control scheme.
3. The method of claim 2 , wherein transmitting the power control change command message to the SS comprises: deciding a power control scheme for an uplink of the SS; comparing the decided power control scheme with a previous power control scheme; and transmitting the power control change command to the SS, if the decided power control scheme is different from the previous power control scheme.
4. A method of determining an uplink power control scheme in a Subscriber Station (SS) for a wireless communication system supporting at least two uplink power control schemes, the method comprising: transmitting, to a Base Station (BS), a power control change request message including information about a requested power control scheme; and wherein the power control change request message includes a power control mode change field indicating the requested power control scheme by the SS, and an Uplink (UL) Transmission (Tx) power field indicating a transmit power of an uplink burst that carries the power control change request message, and wherein the power control change command message includes a power control mode change field indicating a decided power control scheme, a start frame field indicating a frame number at which the indicated power control scheme is activated, a power adjust field indicating a change in power level that the SS should apply to its current transmission power if the indicated power control scheme is a closed-loop power control scheme, and an Offset perSS field indicating a change in power level that the SS should apply to an open-loop power control formula if the indicated power control scheme is an open-loop power control scheme.
5. The method of claim 4 , further comprising determining by the subscriber station, whether to change a power control scheme based on the velocity of the subscriber station.
6. The method of claim 4 , wherein transmitting the power control change to the BS comprising of: deciding the power control scheme according a status of the SS; comparing the decided power control scheme with a previous power control scheme; and transmitting the power control change request message to the BS, if the decided power control scheme is different from the previous power control scheme.
7. The method of claim 4 , further comprising transmitting a bandwidth request message to the BS, if the SS requests a bandwidth from the BS, wherein the bandwidth request message includes a Bandwidth Request (BR) field indicating an amount of uplink data to be transmitted and a UL Tx Power field indicating a transmit power of an uplink burst that carries the bandwidth request message.
8. A method of determining an uplink power control scheme in a Base Station (BS) of a wireless communication system supporting at least two uplink power control schemes, the method comprising: deciding a power control scheme for an uplink of a Subscriber Station (SS); and transmitting a power control change command message including information about the decided power control scheme to the SS, wherein the power control change command message includes a power control mode change field indicating the decided power control scheme, a start frame field indicating a frame number at which the indicated power control scheme is activated, a power adjust field indicating a change in power level that the SS should apply to its current transmission power if the indicated power control scheme is a closed-loop power control scheme, and an Offset perSS field indicating a change in power level that the SS should apply to an open-loop power control formula, if the indicated power control scheme is the-an open-loop power control scheme.
9. The method of claim 8 , wherein deciding the power control scheme is performed, upon request from the SS.
10. The method of the claim 8 , wherein transmitting the power control change command message to the SS: comparing the decided power control scheme with a previous power control scheme; and transmitting the power control command message to the SS, if the decided power control scheme is different from the previous power control scheme.
11. A method of determining an uplink power control scheme in a Subscriber Station (SS) of a wireless communication system supporting at least two power control schemes, the method comprising: receiving a power control change command message from a Base Station (BS); extracting information about a decided power control scheme from the power control change command message; selecting a power control scheme according to the extracted information; and determining a transmit power of an uplink signal according to the selected power control scheme; wherein the power control change command message includes a power control mode change field indicating the decided power control scheme, a start frame field indicating a frame number at which the indicated power control scheme is activated, a power adjust field indicating a change in power level that the SS should apply to its current transmission power, if the indicated power control scheme is a closed-loop power control scheme, and an Offset perSS field indicating a change in power level that the SS should apply to an open-loop power control formula, if the indicated power control scheme is an open-loop power control scheme.
12. The method of claim 11 , further comprising transmitting a bandwidth request message to the BS, if the SS requests a bandwidth from the BS; wherein the bandwidth request message includes a Bandwidth Request (BR) field indicating an amount of uplink data to be transmitted and an UpLink (UL) Transmission (Tx) power field indicating a transmit power of an uplink burst that carries the bandwidth request message.
Unknown
July 7, 2009
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